Crow is a C++ microframework for building HTTP/WebSocket web services, inspired by Python's Flask. It is a header-only library that provides a rich set of features including typed routing, middleware pipelines, JSON serialization/deserialization, Mustache templating, WebSocket support, multipart parsing, static file serving, compression (zlib), SSL (OpenSSL), CORS, sessions, and blueprints for modular route organization. The architecture is based on ASIO (standalone or Boost) for asynchronous I/O, with a trie-based URL router, a flexible middleware system supporting both global and per-route middleware, and a compile-time parameter validation mechanism. The library is designed for ease of use with macros like CROW_ROUTE and CROW_WEBSOCKET_ROUTE, and it supports both TCP and Unix domain sockets. The codebase demonstrates strong engineering practices with extensive unit tests (Catch2), fuzz testing, CI/CD across multiple platforms (Linux, macOS, Windows) and compilers (GCC, Clang, MSVC), and integration with package managers (vcpkg, Conan, Homebrew). The middleware system, blueprint system, and JSON library are particularly well-crafted, offering reusable patterns that could be extracted for other projects. The repository is actively maintained with regular commits, issue triage, and community contributions. While primarily a web framework, Crow also includes utility components (base64, query string parsing, case-insensitive maps) that are self-contained and reusable. The project is not a data research repository; it is a production-ready application framework with a focus on performance and ease of use.